Processors don't work with max frequency where kernel-4.14.0-49.el7a.ppc64le runs on IBM Power9 server.

Solution Unverified - Updated -

Issue

  • Processors don't work with max frequency where kernel-4.14.0-49.el7a.ppc64le runs on IBM Power9 server.
# ppc64_cpu --frequency
min:    3.308 GHz (cpu 56)
max:    3.308 GHz (cpu 0)
avg:    3.308 GHz

$ cat ./sos_commands/processor/lscpu
Architecture:          ppc64le
Byte Order:            Little Endian
CPU(s):                128
On-line CPU(s) list:   0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60,64,68,72,76,80,84,88,92,96,100,104,108,112,116,120,124
Off-line CPU(s) list:  1-3,5-7,9-11,13-15,17-19,21-23,25-27,29-31,33-35,37-39,41-43,45-47,49-51,53-55,57-59,61-63,65-67,69-71,73-75,77-79,81-83,85-87,89-91,93-95,97-99,101-103,105-107,109-111,113-115,117-119,121-123,125-127
Thread(s) per core:    1
Core(s) per socket:    16
Socket(s):             2
NUMA node(s):          2
Model:                 2.2 (pvr 004e 1202)
Model name:            POWER9, altivec supported
CPU max MHz:           3800.0000
CPU min MHz:           2166.0000
L1d cache:             32K
L1i cache:             32K
L2 cache:              512K
L3 cache:              10240K
NUMA node0 CPU(s):     0,4,8,12,16,20,24,28,32,36,40,44,48,52,56,60
NUMA node8 CPU(s):     64,68,72,76,80,84,88,92,96,100,104,108,112,116,120,124

$ cat ./sos_commands/processor/cpupower_frequency-info
analyzing CPU 0:
  driver: powernv-cpufreq
  CPUs which run at the same hardware frequency: 0 1 2 3
  CPUs which need to have their frequency coordinated by software: 0
  maximum transition latency:  Cannot determine or is not supported.
  hardware limits: 2.17 GHz - 3.80 GHz
  available frequency steps:  2.90 GHz, 2.88 GHz, 2.87 GHz, 2.85 GHz, 2.83 GHz, 2.82 GHz, 2.80 GHz, 2.78 GHz, 2.77 GHz, 2.75 GHz, 2.73 GHz, 2.72 GHz, 2.70 GHz, 2.68 GHz, 2.67 GHz, 2.65 GHz, 2.63 GHz, 2.62 GHz, 2.60 GHz, 2.58 GHz, 2.57 GHz, 2.55 GHz, 2.53 GHz, 2.52 GHz, 2.50 GHz, 2.48 GHz, 2.47 GHz, 2.45 GHz, 2.43 GHz, 2.42 GHz, 2.40 GHz, 2.38 GHz, 2.37 GHz, 2.35 GHz, 2.33 GHz, 2.32 GHz, 2.30 GHz, 2.28 GHz, 2.27 GHz, 2.25 GHz, 2.23 GHz, 2.22 GHz, 2.20 GHz, 2.18 GHz, 2.17 GHz
  available cpufreq governors: conservative userspace powersave ondemand performance
  current policy: frequency should be within 2.17 GHz and 3.80 GHz.
                  The governor "performance" may decide which speed to use
                  within this range.
  current CPU frequency: 3.80 GHz (asserted by call to hardware)

Environment

  • RHEL7.5 kernel-alt kernel-4.14.0-49.el7a.ppc64le
  • IBM Power9 server

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase of over 48,000 articles and solutions.

Current Customers and Partners

Log in for full access

Log In
Close

Welcome! Check out the Getting Started with Red Hat page for quick tours and guides for common tasks.